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CONTENTS. 
PAGE 
Introduction..., 1 
Shore-lines of Lake Algonquin and its correlatives, and 
Algonquin river 4 
Lake Simcoe and Balsam Lake districts 4 
Sturgeon Lake basin 8 
Pigeon-Buckhorn Lake basin 10 
Stony Lake- Rice Lake district 11 
Relation of Lake Algonquin to Lake Iroquois, 13 
Description and interpretation of outline map and profile, 
showing character of the differential uplift. . 17 
Summary 20 
ILLUSTRATIONS. 
Map 1619. Diagram showing shore-lines of Lake Algon- 
quin and Lake Iroquois 22 
Plate I. Scoured rock floor of ancient Algonquin River 
channel at Bobcaygeon, Ontario 23 
II. East limit of ancient Algonquin River channel 
near Keene, Ontario 25 
III. Small fold and fault in Trenton limestone, 
Trent canal, Kirkfield, Ontario; looking 
southeast along strike of fault. 27 
